CONDENSED CONSOLIDATED STATEMENT OF INCOME (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Apr. 01, 2022	Apr. 02, 2021
Income Statement [Abstract]
Revenue from product sales and services	$ 4,103	$ 4,567
Cost of product sales and services	(2,892)	(3,213)
Engineering, selling and administrative expenses	(713)	(801)
Business divestiture-related losses	0	(15)
Impairment of goodwill and other assets	0	(62)
Non-operating income	106	117
Interest expense, net	(68)	(66)
Income from continuing operations before income taxes	536	527
Income taxes	(61)	(60)
Income from continuing operations	475	467
Discontinued operations, net of income taxes	0	(1)
Net income	475	466
Noncontrolling interests, net of income taxes	0	2
Net income attributable to L3Harris Technologies, Inc.	475	468
Amount attributable to L3Harris Technologies, Inc. common shareholders
Income from continuing operations	475	469
Discontinued operations, net of income taxes	0	(1)
Net income attributable to L3Harris Technologies, Inc.	$ 475	$ 468
Basic
Continuing operations (in dollars per share)	$ 2.46	$ 2.27
Discontinued operations (in dollars per share)	0	(0.01)
Total basic net income per common share (in dollars per share)	2.46	2.26
Diluted
Continuing operations (in dollars per share)	2.44	2.25
Discontinued operations (in dollars per share)	0	0
Diluted (in dollars per share)	$ 2.44	$ 2.25
Basic weighted average common shares outstanding (in shares)	193,200,000	206,700,000
Diluted weighted average common shares outstanding (in shares)	195,100,000	208,500,000